minimum airspeed in your gyro

Oh no he left the hose loose it swung round and attacked the pitot tube...hang on a sec he's going -80 kts!!!!!!!! Wow.
 
Ok.....You guys guessed pretty close. I have decided to go with a DeWalt motor.....turns 30,000 instead of 62,000 but at least I have a motor. I just will have to add more pitch to the slower turning rotor......


YouTube - DeWalt powered Helicycle


Stan
 
ROFL good one Stan :) A motor is a motor..... And that's all I have to say about that (Forrest Gump)
 
Stan,

Glad you're going green and turning in that fuel hog turbine for an electric hybrid!

As for the minimum airspeed in the original post........I'll donate for flowers.


Barry (told ya so) K
 
The rotors slow down and you risk inflight blade flap,
Wot makes you think that Ron?
The blades slow coz the weight hangn off them is less [ lower AOA]. Theres no reason why theyd flap.
The airspeed difference between advancing and retreating blade is minimal, so teeter is also. No reason for blade flap.

The main things to watch for at min AS at WOT is torque roll and sink. Things can turn to sh1t real quick wen you start sinkn at WOT and nose high, like reversed airflow. Wen this happens, the machine can change attitude or rotate or both, real fast, and the slow RRpm means the blades may not be able to keep up, and youll get serious cyclic flappn.

BTW, the ferel will sit there all day at 0 IAS.
[ bout 15 actual]
 
Birdy if you get the blades too slow, they loose their stiffness and you can flap them
 
I agree that the blades will slow a little at slow airspeed. We do not have an elevator so we can not hang on the prop like a fixed wing. Unless the attitude is attained by a high speed steep climb or some other unusual maneuver things will stabilize and the rotor rpm will not slow to the point of losing the ability to support the gyro.

With a stable gyro you will enter a high descent rate and slow airspeed configuration when you lift the nose past the minimum steady flight speed.

The blades slow due to the fact that they are not generating as much lift. But once the descent rate stabilizes the rotor rpm decay will abate. The recovery is simple let the nose down and gain air speed. The high descent rate and slow airspeed maneuver is part of the PTS in the US. The book specifies that the power setting be less than cruse power for the test. I have tried it with higher power settings and monitored the RRPM I have never seen anything close to excessively low rotor speeds.

I believe that The flap that Ron is referring to occurs when the load is removed from the rotor. A steep climb followed by a push over at the top would do it. Not a recommended maneuver and possibly deadly. If you do remove the load from the rotor they will not stay in plane and may chop any part of the gyro. I don't believe the rotor will have time to fold prior to making hash out of the aircraft but have not tried it or seen it tried.

Take care
 
Micheal, what I am describing may not be possible in the types of gyros you fly in, or most gyros.... But in my own gyro with the long rotors and the amount of thrust my engine produces, it is very easy to slow the rotors to a rpm lower than the lowest rpms shown at lift off. I have avoided allowing them to go any slower as I was warned by the manufactor of the blades that at this slow of a speed they loose their stiffness and can flap or even buckle.... bad things would happen in other words.

But what your saying is no matter how powerful your engine, nor how light your blade loading is, you can pull back stick and slow to zero airspeed at full power and there are no issues to be concerned about?
 
GyroRon said:
Micheal, what I am describing may not be possible in the types of gyros you fly in, or most gyros.... But in my own gyro with the long rotors and the amount of thrust my engine produces, it is very easy to slow the rotors to a rpm lower than the lowest rpms shown at lift off. I have avoided allowing them to go any slower as I was warned by the manufactor of the blades that at this slow of a speed they loose their stiffness and can flap or even buckle.... bad things would happen in other words.

But what your saying is no matter how powerful your engine, nor how light your blade loading is, you can pull back stick and slow to zero airspeed at full power and there are no issues to be concerned about?
Click to expand...

If you are flying close to the low blade speed limit in your gyro then I would worry about the blades in all flight attitudes. If you are close to this low speed limit It may be wise to decrease the rotor size.

The nose of the gyro can not be held up with out some force. Unless you have a LTL gyro or a controllable elevator you will be unable to maintain an attitude that allows the engine thrust to take much of the load.

Ron what RRPM did the manufacture set as the low speed limit? I have practiced high power low speed flight in the SH the RRPM drops only about 30 RRPM below normal flight RRPM and is well within RRPM limits. I did this yesterday just to get the numbers. I had full power IAS of 0 and RRPM -30 from level flight. The only issue is that the gyro wants to spin to the left.
 
Last edited:
Ron's gyro is LTL
 

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